#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

const char* filename = "log.txt";

int main()
{
    fprintf(stdout, "hello normal printf\n");
    fprintf(stdout, "hello normal printf\n");
    fprintf(stdout, "hello normal printf\n");
    fprintf(stderr, "hello error printf\n");
    fprintf(stderr, "hello error printf\n");
    fprintf(stderr, "hello error printf\n");
    return 0;
}
